Add a notice to explain why File widget settings might be unavailable

starlight-sparklerequested to merge
issue/drupal-3037204:3037204-file-field-settings into 11.x

Closes #3037204
Proposed resolution from dww is not advisable as it would require a significant change to EntityDisplayFormBase. As a workaround, set #disabled instead of #access on the progress indicator field and add a message to explain the reason.

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